Hi all,
I'm using Tesseract 3.03a on Mac OS X 10.9, built with Apple's tools
(clang/++). I was playing around with the Viewer described in
http://code.google.com/p/tesseract-ocr/wiki/ViewerDebugging
and tried changing the value of some config parameters by right-clicking
in the Editor image window, choosing some parameter from the menu and
entering a new value for it. However doing so had no effect, aside from
causing the console to spit out: "w1:Setting ERROR: ParamContent::GetName()
to"
I debugged with LLDB, and it turned out that in the ParamsEditor::Notify()
method (in ccmain/paramsd.cpp) the ParamContent object returned was somehow
getting its "param_type_" member messed with so that it ended up with a
value other than its allowed values of 0, 1, 2 or 3 (corresponding to
(VT_INTEGER, VT_BOOLEAN, VT_DOUBLE and VT_STRING).
Setting a watchpoint at the memory location of param_type_ of one of the
ParamContent objects led me to discover that as soon as
theParamsEditor::BuildListOfAllLeaves() method returns, the destructor for
the local ParamContent_LIST object (vcList) gets called which in turn
"zaps" all its elements. This is the backtrace from LLDB:
/**********************/
* thread #1: tid = 0x2dde5d, 0x00007fff94c3ff5f
libsystem_malloc.dylib`tiny_free_list_add_ptr + 124, queue =
'com.apple.main-thread, stop reason = watchpoint 1
frame #0: 0x00007fff94c3ff5f
libsystem_malloc.dylib`tiny_free_list_add_ptr + 124
frame #1: 0x00007fff94c3c1ae
libsystem_malloc.dylib`szone_free_definite_size + 1992
frame #2: 0x00000001000639bd
tesseract`ParamContent_zapper(link=0x0000000100c51330) + 45 at
paramsd.cpp:55
frame #3: 0x000000010026711a
tesseract`ELIST::internal_clear(this=0x00007fff5fbfeaa0,
zapper=0x0000000100063990)(ELIST_LINK*)) + 106 at elst.cpp:58
frame #4: 0x00000001000682cc
tesseract`ParamContent_LIST::clear(this=0x00007fff5fbfeaa0) + 28 at
paramsd.h:86
frame #5: 0x0000000100068291
tesseract`ParamContent_LIST::~ParamContent_LIST(this=0x00007fff5fbfeaa0) +
17 at paramsd.h:86
frame #6: 0x0000000100066905
tesseract`ParamContent_LIST::~ParamContent_LIST(this=0x00007fff5fbfeaa0) +
21 at paramsd.h:86
frame #7: 0x0000000100065264
tesseract`ParamsEditor::BuildListOfAllLeaves(this=0x0000000100c46e60,
tess=0x0000000101800000) + 3540 at paramsd.cpp:266
frame #8: 0x000000010006594d
tesseract`ParamsEditor::ParamsEditor(this=0x0000000100c46e60,
tess=0x0000000101800000, sv=0x0000000100c46d50) + 253 at paramsd.cpp:301
frame #9: 0x0000000100065845
tesseract`ParamsEditor::ParamsEditor(this=0x0000000100c46e60,
tess=0x0000000101800000, sv=0x0000000100c46d50) + 37 at paramsd.cpp:319
frame #10: 0x0000000100069fcd
tesseract`tesseract::Tesseract::pgeditor_main(this=0x0000000101800000,
width=640, height=480, page_res=0x0000000100c5b170) + 205 at pgedit.cpp:350
frame #11: 0x00000001000067fc
tesseract`tesseract::TessBaseAPI::Recognize(this=0x00007fff5fbff998,
monitor=0x0000000000000000) + 1100 at baseapi.cpp:845
frame #12: 0x000000010000785f
tesseract`tesseract::TessBaseAPI::ProcessPage(this=0x00007fff5fbff998,
pix=0x0000000100d00e40, page_index=0, filename=0x00007fff5fbffcbc,
retry_config=0x0000000000000000, timeout_millisec=0,
renderer=0x0000000100d00e00) + 383 at baseapi.cpp:1153
frame #13: 0x0000000100007285
tesseract`tesseract::TessBaseAPI::ProcessPages(this=0x00007fff5fbff998,
filename=0x00007fff5fbffcbc, retry_config=0x0000000000000000,
timeout_millisec=0, renderer=0x0000000100d00e00) + 613 at baseapi.cpp:1025
frame #14: 0x000000010000201d tesseract`main(argc=5,
argv=0x00007fff5fbffb48) + 5485 at tesseractmain.cpp:295
frame #15: 0x00007fff87b915fd libdyld.dylib`start + 1
frame #16: 0x00007fff87b915fd libdyld.dylib`start + 1
/**********************/
My C++ is a bit fuzzy, so I'm not sure if this is to be expected; I can see
that "vclist" is no longer in scope and hence is expected to be destroyed
- but there's also the consideration that the static variable "vcMap"
holds pointers to the ParamContent objects. (I'm more used to Objective-C
with automatic reference counting, hence my confusion!) Is this a bug?
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